JP2015138632A - induction heating cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To correctly detect a temperature of a cooking pot even when the cooking pot is placed out of a central part of an induction heating coil.SOLUTION: In an induction heating cooker including three temperature detectors under each mounting frame of a top plate: one of the temperature detectors is arranged at a position covered with a pot bottom of a heated object even when a heated object of the usable minimum diameter is mounted on any position within a range of the mounting frame; and one is arranged in an arrangement region not covered with the pot bottom of the heated object when the heated object is mounted on the depth side or on the left side of the mounting frame, and in an arrangement region covered with the pot bottom of the heated object when the heated object of the usable minimum diameter is mounted on the central part or on the near side or the right side of the mounting frame; and one is arranged in a region not covered with the pot bottom of the heated object when the heated object is mounted on the near side or on the right side of the mounting frame, and in an arrangement region covered with the pot bottom of the heated object when the heated object of the usable minimum diameter is mounted on the central part or on the depth side or on the left side of the mounting frame.

Description

  The present invention relates to an induction heating cooker provided with an induction heating coil in a casing and having a heat-resistant glass top plate disposed on the upper surface thereof.

  In Patent Document 1, as shown in FIG. 1 of the same document, the temperature detection unit disposed in the induction heating coil is divided into the central part of the induction heating coil and the central part at the boundary that equally divides the induction heating coil into left and right. There is disclosed an induction heating cooker that is arranged in three locations linearly on the far side and on the near side.

JP-A-2005-353533

  In the induction heating cooker described in Patent Document 1, only when the minimum-diameter pan that can be used in the induction heating cooker is placed at the center, back, and front of the induction heating coil, the center and back The temperature detector arranged on the front side is covered with the pan bottom. However, when the pan is moved to the left or right side, only one temperature detection unit provided in the central portion of the induction heating coil is covered with the pan bottom, and the temperature of the pan bottom is a single temperature provided in the central portion. It is detected only by the detection unit. Therefore, when the pan bottom is deformed, there is a problem that the temperature of the pan bottom cannot be detected at an early stage.

  The present invention has been made in order to solve the above-described problems. In claim 1, the top plate displaying an annular mounting frame on which a pan is mounted, and provided below the mounting frame, An induction heating cooker comprising: an induction heating coil for induction heating a pan; and three temperature detectors provided on the lower surface of the top plate for detecting the temperature of the pan placed in the mounting frame. In the above, the first temperature detector is disposed at a position where the pot having the smallest diameter that can be used is covered with the bottom of the pan regardless of where the pan is placed in the mounting frame, and the second temperature detector can be used. When the pan with the smallest diameter is installed at the center of the mounting frame, or when it is placed inscribed on the front side or the right side of the mounting frame, the pan is covered with the pan bottom and When placed inscribed on the back side or the left side of the frame, place it in a position where it is not covered by the pan bottom. The third temperature detector is either a case where a pot having the smallest diameter that can be used is installed at the center of the mounting frame, or a case where the pan is inscribed on the back side or the left side of the mounting frame. Also, it was placed at a position where it was covered with the bottom of the pan and not covered with the bottom of the pan in any case where it was inscribed on the front side or the right side of the mounting frame.

  Moreover, in Claim 2, the top plate which displayed the cyclic | annular mounting frame which mounts a pan, The induction heating coil which is provided under the said mounting frame and induction-heats the said pan, The lower surface of the said top plate In the induction heating cooker provided with three temperature detectors for detecting the temperature of the pan placed in the mounting frame, the first temperature detector has a minimum usable diameter. The pan is placed at a position where it is covered by the pan bottom no matter where the pan is placed in the mounting frame, and the second temperature detector has the smallest usable pan in the center of the mounting frame. Either when installed, or when inscribed on the front side or the left side of the mounting frame, either covered with the bottom of the pan and inscribed on the back side or the right side of the mounting frame The third temperature detector is placed in a position where it is not covered by the bottom of the pan. Both when placed in the center of the placement frame, or when inscribed on the back or right side of the previous placement frame, are covered by the bottom of the pan and placed on the front or left side of the previous placement frame. In any case of placing in close contact, it was placed at a position where it was not covered by the pan bottom.

  According to the present invention, even when a cooking pot with a small diameter is used and the cooking pot is placed off the center of the induction heating coil, the temperature of the bottom of the pot is quickly determined by the inner temperature detector and the outer temperature detector. It is possible to detect and control the electric power of the induction heating coil at an early stage. It can be carried out.

It is a perspective view of the state which stored the built-in type induction heating cooking appliance concerning one example in the system kitchen. It is explanatory drawing which shows the upper surface of the induction heating cooking appliance. It is explanatory drawing which shows the state which removes the top plate of the upper surface of the same induction heating cooking appliance, and can see an induction heating coil. It is explanatory drawing of a heating state when a cooking pan is heated with the induction heating cooking appliance. (A), (b) is explanatory drawing of the temperature rise in explanatory drawing of FIG. It is a block diagram explaining the heating part of the induction heating cooking appliance, and its control. (A), (b) is explanatory drawing explaining the position which arrange | positions a temperature detector.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  1 to 7 show an induction heating cooker according to the first embodiment. The cooking device shown in FIG. 1 is a built-in induction heating cooking device provided with pan mounting portions 6a, 6b, and 6c at three locations on the top plate 3, as will be described in detail below. In addition, the present Example is not limited to the built-in type that fits in the kitchen, but may be a stationary heating cooker that is placed in the kitchen.

  The casing 2 of the cooking device is incorporated by being dropped from the upper surface of the system kitchen 1 and installed. After the installation, a roaster unit 4 and an operation unit panel 5, which will be described later, can be operated from the front part of the system kitchen 1.

  A cooking pan (symbol 20 in FIG. 4) that is an object to be heated when cooking is placed on a top plate 3 made of heat-resistant glass or the like disposed on the upper surface of the housing 2. The cooking pan can be cooked by being placed on the placing portion 6 drawn on the top plate 3.

  The placement portion 6 is provided with a placement portion right 6a and a placement portion left 6b on the front surface side of the top plate 3, and a placement portion center 6c at a substantially central portion on the rear side between the placement portions 6a and 6b. Is arranged, and an annular placement frame 19 indicating a range in which the cooking pan 20 as the object to be heated is placed is displayed on the placement unit 6, and the cooking pan 20 is placed in the placement frame 19. By doing, the cooking pan 20 can be heated efficiently. And in the lower part of the housing | casing 2 corresponding to the pan mounting parts 6a, 6b, 6c of the top plate 3, the induction heating coil right 13a for heating a cooking pan, the induction heating coil left 13b, the induction heating coil center 13c Are installed.

  The placement center 6c is a place where it is difficult to reach the user's hand. For this reason, the kind of cooking performed in the mounting portion center 6c is suitable for cooking that does not require the chef to move much, mainly cooking such as stew or heat insulation. In addition, since stew and heat retention require only a weak output and the maximum power consumption is limited, the outputs of the induction heating coil center 13c installed in the placement unit center 6c are set to the placement unit right 6a and the placement unit left. It is set to be weaker than the induction heating coil right 13a and the induction heating coil left 13b installed corresponding to 6b and to reduce power consumption. Specifically, the induction heating coil right 13a and the induction heating coil left 13b are approximately 3 kW, and the induction heating coil center 13c installed in the placement portion center 6c is approximately 1.6 kW.

  1 and 2, a frame 14 for protecting the end face is provided around the top plate 3. A front frame 14a attached to the front upper edge of the top plate 3, a rear frame 14b attached to the rear upper edge of the top plate 3, a right frame 14c attached to the right upper edge, and a left frame attached to the left upper edge. 14d. In this example, the frame is divided into 4 pieces, but it can be integrated or 2 pieces or any number of pieces, and it is not necessary to attach it to the 4 sides of the top plate 3, only in front of the top plate 3, only in the back. , Only two sides on the front and back, or two sides on the left and right.

  The casing 2 is provided with the induction heating coil right 13a, the induction heating coil left 13b, the induction heating coil center 13c, and electronic components (not shown), which are the heat generating members described above, for cooling them. An air inlet 7 for sucking air from outside is provided on the right side of the rear upper surface of the housing 2. The intake port 7 is also located on the right side of the exhaust port 8 provided on the left side of the rear upper surface of the housing 2.

  The air sucked through the air inlet 7 cools the induction heating coil right 13a, the induction heating coil left 13b, the induction heating coil center 13c, and the electronic components that generate heat inside the housing 2, and then the outside of the housing 2 from the air outlet 8 To be discharged. Further, waste heat from the roaster section 4 described later is also discharged from the exhaust port 8 at the same time.

  The roaster section 4 is for baking fish, pizza, and the like, and is disposed on the left or right side of the front surface of the housing 2 (left side in this embodiment). The roaster door 32 is provided with a handle 11. Note that the roaster section 4 is not dedicated to grilled fish and may be called a grill or an oven.

  9 is an upper surface operation unit, which is composed of a plurality of tact switches, and is provided on the front frame 14a. The output adjustment of the induction heating coil right 13a, the induction heating coil left 13b, the induction heating coil center 13c, the setting of the cooking timer, It can be used to call the cooking menu, set the temperature, boiled food, automatic rice cooking, fried food cooking, start and stop heating, etc. Easy operation on the top.

  Reference numeral 10 denotes an upper surface display unit, which is provided on the front side of the top plate 3 along the upper surface operation unit 9. The user can know the output setting, cooking menu, timer value, cooking temperature, etc. set in the upper surface operation unit 9. Display easily.

  Next, the induction heating coil right 13a, the induction heating coil left 13b, and the induction heating coil center 13c will be described with reference to FIG.

  The induction heating coil right 13a is formed by an annular inner induction heating coil 13a1 and an annular outer induction heating coil 13a2 arranged with an annular gap 15 provided on the outer side thereof. The induction heating coil left 13b is formed by an annular induction heating coil 13a2. Magnetic flux generated by both the inner induction heating coil 13b1 and the outer induction heating coil 13b2 formed by the inner induction heating coil 13b1 and the annular outer induction heating coil 13b2 arranged with an annular gap 15 provided on the outer side thereof. To make the temperature at the bottom of the pan uniform.

  In addition, the outermost portion of the induction heating coil 13 prevents the magnetic field generated by the outer induction heating coil 13b2 from spreading outside the outer induction heating coil 13b2, and the cooking pot 20 placed in the placement frame 19 is provided. A non-magnetic ring-shaped magnetic shield ring 21 is provided so that the heating can be performed efficiently. The size of the magnetic shielding ring 21 and the size of the mounting frame 19 are substantially equal. Detailed description of the induction heating coil center 13c is omitted.

  Next, the cooking pot 20 is heated by placing it on the center of the mounting frame 19 and heating it, thereby efficiently heating the cooking pot 20 and reducing heating unevenness on the bottom of the cooking pot 20. However, actually, the cooking pan 20 is close to the user side, and is easily placed on the near side of the housing 2 where the cooking pan 20 is easily placed. Further, the user stands in front of the cooking pan 20 and the user mixes the food contained in the cooking pan 20 with chopsticks while holding the handle of the cooking pan 20 or shaking the cooking pan 20. At times, the movement of the user's hand rarely moves from the near side to the far side (from the far side to the near side) in parallel with the frame right 14c of the housing 2. A case where the cooking pan 20 is placed on the placement unit right 6a of FIG. 2 and the cooking pan 20 is moved will be described as an example. When the user is right-handed, there is a slight diagonal movement from the back left side and the front right side, and when the user is left-handed, there is a tendency for a slight diagonal movement from the back right side to the front left side. Therefore, the cooking pan 20 tends to be closer to either the left or right side of the rear side or the left or right side of the front side with respect to the central portion of the placement area 19. In order to detect that the cooking pan 20 approaches one side, it is possible to positively detect whether the mounting position of the cooking pan 20 is in the center of the mounting frame 19 or in one direction of the mounting frame 19. As described above, it is necessary to control the heating so as to minimize the uneven heating of the bottom of the cooking pan 20 when approaching the placement frame 19.

  Next, a method for detecting the position of the cooking pan 20 by detecting the temperature of the cooking pan 20 described above will be described in detail.

  The induction heating coil 13 is divided into an inner induction heating coil 13a1 and an outer induction heating coil 13a2. The temperature at the bottom of the cooking pan 20 is detected by heat conduction through the top plate 3 to the center of the inner induction heating coil 13a1. An inner temperature detector 16 to detect and an outer temperature detector 17 including two outer temperature detectors 17a and 17b that detect heat by conduction in a gap 15 between the inner induction heating coil 13a1 and the outer induction heating coil 13a2. Done.

  The arrangement of the three temperature detectors described above is arranged so that the placement position of the cooking pan 20 can be detected efficiently, and details will be described later.

  First, an outline of a rough method for detecting the placement position of the cooking pan 20 will be described. The cooking pan 20 can be detected by detecting the temperature rise of a temperature detector that detects the temperature at the bottom of the pan. The detection of the placement position of the cooking pan 20 is performed by each temperature detector arranged at a different position. This is possible by detecting the temperature rise. However, since the pan bottom of the cooking pan 20 has a certain size, the position of the cooking pan 20 with respect to the mounting frame 19 is detected by detecting the temperature of the pan bottom with a plurality of temperature detectors. Can be estimated.

  And when the cooking pot 20 of the minimum diameter which can be used is mounted in the center part of the mounting area 19 showing the range which can heat the cooking pot 20 efficiently, the temperature of a pan bottom is detected with three temperature detectors. The position can be estimated. In addition, the minimum diameter cooking pan is a pan having the smallest diameter, which is defined in the instruction manual of the induction heating cooker, for which safe heating is ensured, for example, the diameter of the mounting frame 19 On the other hand, it is a pan with a diameter of about 60%.

  Moreover, when the external shape of the cooking pot 20 of the minimum diameter which can be used approaches the one direction of the mounting frame 19, the position can be estimated by detecting the temperature of a pan bottom with two temperature detectors. Further, when the cooking pan 20 is placed out of the mounting frame 19, the temperature at the bottom of the pan is detected by one temperature detector, or the position can be estimated by not detecting the temperature at all. A temperature detector is arranged in the mounting frame 19.

  Next, the arrangement of the three temperature detectors described above will be described in detail.

  The top plate 3 is provided with a placement frame 19 that informs the user of the position where the cooking pan 20 is placed in order to heat the cooking pan 20 more efficiently. It is described so that it may be mounted and used in the central part of 19. Moreover, the minimum diameter of the cooking pot 20 which can be used with an induction heating cooking appliance is determined. In the present embodiment, the following description will be made with reference to FIGS. 7A and 7B under the condition that the diameter of the mounting frame 19 is set to 200 mm and the minimum diameter of the cooking pot 20 that can be used is set to 120 mm.

  FIG. 7 shows the placement frame 19 and shows an example in which the cooking pot 20 having the smallest diameter that can be used there is placed at a different position. In FIG. 7, the straight line dividing the mounting frame 19 into the left and right is the Y axis, the straight line dividing the front and back is the X axis, X positive and Y positive are in the first quadrant, X negative and Y positive are in the second quadrant, and X negative. Y negative is defined as the third quadrant, and X positive and Y negative is defined as the fourth quadrant. Moreover, the cooking pot 20 with the smallest diameter placed in the center of the placement frame 19 is 20a, the one placed inscribed on the back side (Y) of the placement frame 19 is 20b, and the left side of the placement frame 19 (- X) is inscribed on the inside (20), 20d is inscribed on the front side (-Y) of the mounting frame 19, and is inscribed on the right side (X) of the mounting frame 19. Shown as 20e.

  And the minimum condition 1 of the arrangement | positioning conditions of the three temperature detectors is the temperature of a pan bottom with three temperature detectors with respect to the cooking pan 20a mounted in the center part of the mounting frame 19. Arrange it at a position where it can be detected. Condition 2 arranges in the position which can detect the temperature of a pan bottom with two temperature detectors, when the external shape of the minimum diameter cooking pan 20 which can be used approaches one direction of the mounting frame 19. FIG. An arrangement satisfying this condition is the arrangement shown in FIG.

  The inner temperature detector 16 shown in FIG. 3 is provided in the center of the mounting frame 19, and the outer temperature detector 17 is located at two locations in the second and fourth quadrants in the mounting frame 19 described above. The arrangement will be described below with reference to FIG.

  First, the arrangement position of the outer temperature detector 17 will be described with reference to FIGS.

  As for the arrangement position of the outer temperature detector 17, when the condition 1 of the arrangement condition is confirmed, when the cooking pot 20a having the smallest diameter that can be used is placed at the center of the placement area 19, the bottom of the pot is set with three temperature detectors. The three temperature detectors are located at the positions covered by the bottom of the cooking pan 20a showing the cooking pan 20 placed in the center of the placement area 19 shown in the figure. Place. Next, when the outer shape of the cooking pot 20 with the smallest diameter that can be used, which is Condition 2, approaches the frame of the mounting frame 19, it is necessary to arrange it at a position where the temperature of the pan bottom can be detected by two temperature detectors. In that case, when the cooking pan 20 is moved to the position of the cooking pan 20b and the cooking pan 20c displayed with the cooking pan 20 shown in the figure, it is necessary to satisfy the condition 1 and the condition 2 The position of one temperature detector that does not detect the temperature at the bottom of the pan needs to be arranged in the region 22d that is not covered by the pan bottom of the cooking pan 20b and the cooking pan 20c. In addition, when the cooking pan approaches the position of the cooking pan 20d and the cooking pan 20e, the position of one temperature detector that does not detect the temperature of the pan bottom necessary to satisfy the condition 1 and the condition 2 is It is necessary to arrange | position in the area | region 22b which is not covered with the pan bottom of the cooking pot 20d and the cooking pot 20e.

  From the above, one of the three temperature detectors is arranged at a substantially central portion that is covered by the pan bottom even when the cooking pan 20 is placed at any position in the placement frame 19. One is a region 22d. One is the region 22b.

  However, condition 2 is that when the outer diameter of the cooking pot 20 having the smallest diameter that can be used approaches the frame of the mounting frame 19, it is necessary to arrange the temperature at the bottom of the pan with two temperature detectors. The final arrangement position of the three temperature detectors is one arranged in the center, and one is covered by the pan bottom when the cooking pan is placed on the cooking pans 20b and 20c, and in the region 22b described above. It arrange | positions in the range of the arrangement | positioning area | region 23b included. One is that the cooking pan is placed on the cooking pans 20d and 20e when the cooking pan is placed on the bottom of the pan, and needs to be arranged in the range of the arrangement region 23d included in the region 22d described above.

  In other words, the first temperature detector is disposed at a position where the pan with the smallest usable diameter is covered with the pan bottom no matter where the pan is placed in the mounting frame, and the second temperature detector is used. When the pan with the smallest possible diameter is installed at the center of the mounting frame, or when it is placed inscribed on the front side or the right side of the mounting frame, the pan is covered with the pan bottom, and The third temperature detector is arranged at a position where it is not covered with the bottom of the pan when inscribed or placed on the back side or the left side of the placement frame. Any of the above-mentioned placement frame, or the inscribed placement on the back side or the left side of the previous placement frame, which is covered by the pan bottom, and inscribed on the near side or the right side of the previous placement frame In the case of, it is arranged at a position not covered by the pan bottom.

  And by arrange | positioning a temperature detector in the arrangement | positioning area | region 23b and the arrangement | positioning area | region 23d calculated | required from the center part of the mounting area 19 demonstrated above, and the positional relationship of the cooking pot 20 of the minimum diameter which can be used with the mounting area 19, Even if the cooking pot 20 having the smallest diameter that can be used is displaced from the central portion of the placement area 19, it is possible to reliably detect this displacement and control the induction heating coil.

  Moreover, each temperature detector needs to be completely contained in the arrangement | positioning area | region 23 shown in figure. Therefore, the remaining temperature detectors other than the temperature detector arranged at the center of the placement area 19 are not arranged on the X axis and Y axis in the drawing.

  Further, although the above-described arrangement area 23 is obtained in the second quadrant and the fourth quadrant shown in the figure, the same effect can be obtained even if the same arrangement area 23 based on the above is obtained in the first quadrant and the third quadrant.

  In other words, the first temperature detector is disposed at a position where the pan with the smallest usable diameter is covered with the pan bottom no matter where the pan is placed in the mounting frame, and the second temperature detector is used. When the pan with the smallest possible diameter is installed in the center of the mounting frame, or when inscribed on the front side or the left side of the mounting frame, the pan is covered with the pan bottom, and The third temperature detector is arranged at a position where it is not covered by the bottom of the pan when inscribed on the back side or the right side of the mounting frame. Any of the above-mentioned placement frame or the inscribed placement on the back side or the right side of the mounting frame is covered with the bottom of the pan, and the inscribed placement is placed on the near side or the left side of the previous mounting frame. In the case of, it is arranged at a position not covered by the pan bottom.

  And the temperature detector is arranged in the central part and the second quadrant and the fourth quadrant, or the central part and the first quadrant and the third quadrant, and is inclined with respect to the frame right 14c of the housing 2, The disposition of the cooking pan 20 from the user's convenience described above is easy to detect.

  Therefore, regarding the division of the induction heating coil 13, the inner induction heating coil 13a1 and the outer induction heating coil 13a2 are provided so as to obtain a gap 15 in which the outer temperature detector 17 can be arranged in the arrangement area 23b and the arrangement area 23d. Two outer temperature detectors 17 are provided in the gap 15 at positions corresponding to the arrangement region 23.

  The three temperature detectors of the inner temperature detector 16, the outer temperature detector 17a, and the outer temperature detector 17b may be arranged linearly, and the outer temperature detector 17 is provided in the arrangement region 23 described above. If so, they may be arranged non-linearly.

  However, in this embodiment, the outer temperature detector 17 shown in FIG. 3 is arranged by linearly arranging three temperature detectors of the inner temperature detector 16, the outer temperature detector 17a, and the outer temperature detector 17b. When the cooking pot 20 having the smallest diameter that can be used is placed in a region that is not arranged, for example, in the first quadrant and the third quadrant shown in FIG. 7, the heat of the placed cooking pan 20 causes the top plate 3 to be heated. The outer temperature detector 17a and the outer temperature detector 17b are transmitted under the same conditions.

  The induction heating coil right 13a, the induction heating coil left 13b, and the induction heating coil center 13c employ litz wires to suppress the skin effect. A voltage of several tens of kHz and several hundreds of volts is applied to the induction heating coil right 13a, the induction heating coil left 13b, and the induction heating coil center 13c from an inverter 72 described later in order to heat the cooking pot 20.

  Next, the control will be briefly described with reference to FIG. Note that the control of the roaster unit 4 is not directly related to the present embodiment, and is not shown in the figure.

  The operation / display unit 75 includes the upper surface operation unit 9 and the upper surface display unit 10 described so far. Menus, output information, cooking start / off information, etc., input by operating the operation / display unit 75 are sent to the control means 74 as an input signal 80, and information recognized by the control means 74, processing status such as cooking progress, etc. Is sent to the operation / display unit 75 as a display signal 79 and displayed on the upper surface display unit 10 or the like.

  The control means 74 controls each heating part based on the contents set by the operation / display part 75 and a program such as automatic cooking incorporated in advance. Based on the set contents, setting information on the start, stop, and output of cooking is sent to an inverter control means 73 to be described later via a control signal 78.

  The inverter control means 73 performs setting of power to the induction heating coil right 13a, the induction heating coil left 13b, and the induction heating coil center 13c, and starting and stopping of energization based on instructions from the control means 74.

  Further, the control means 74 is provided in the temperature detector 17 including the inner temperature detector 16 and the outer temperature detectors 17a and 17b provided in the induction heating coil right 13a and the induction heating coil left 13b, and the induction heating coil center 13c. The control signal 78 carrying the temperature information from the temperature detector 18 is received, and the inverter 72 is controlled by sending an inverter control signal 76 to the inverter 72, so that the induction heating coil right 13a, the induction heating coil left 13b, The power consumption of the induction heating coil center 13c is monitored and corrected.

  Monitoring and correcting the outputs of the induction heating coil right 13a, the induction heating coil left 13b, and the induction heating coil center 13c is based on the input current and input voltage of each heating coil 13 sent from the inverter 72 by the detection signal 77. The power consumption is calculated, and the inverter 72 is controlled by the inverter control signal 76 so that the output becomes a set value.

  The inverter 72 is a means for supplying output to the induction heating coil right 13a, the induction heating coil left 13b, and the induction heating coil center 13c, and supplies power to the heating coil 13 based on an instruction from the inverter control means 73. Do. Similarly to the inverter control means 73, the inverter 72 is provided with an inverter right 72a, an inverter left 72b, and an inverter center 72c for each of the induction heating coil right 13a, the induction heating coil left 13b, and the induction heating coil center 13c. . Then, the input voltage and input current of each induction heating coil 13 (13 a, 13 b, 13 c) are detected, put on each detection signal 77, and sent to the inverter control means 73.

  Next, the operation will be described. As an example, a case will be described in which the user places and heats the cooking pot 20 that is an object to be heated on the placement unit right 6a.

  First, when the output key of the upper surface operation unit 9 is pressed, the pressed key signal becomes an input signal 80 and is sent to the control means 74. The control means 74 recognizes that the output key has been input, and this content Is transmitted to the operation / display unit 75 as a display signal 79, and the lamp of the upper surface display unit 10 is turned on.

  Next, when the OFF / ON key of the upper surface operation unit 9 is pressed, the lamp is turned on through the same transmission path (hereinafter, description of the same signal path is omitted), and heating is started.

  When the control means 74 instructs to start cooking, the output set to the inverter control means right 73a is transmitted by the control signal right 78a, and the inverter control means right 73a that receives this transmits the output to the inverter right 72a so that the set output is obtained. The power control of the induction heating coil right 13a is performed. The inverter right 72a carries the detected values of the input voltage and input current on the detection signal right 77a and transmits them to the inverter control means right 73a. The inverter control means right 73a calculates the power consumption from the detected values, and the set output is consumed. The power control of the induction heating coil right 13a is performed so as to be electric power (the description of the same signal path is omitted hereinafter).

  Cooking is performed by the above-described operation. With respect to these operations, the cooking pan 20 is placed on the placement portion left 6b and the placement portion center 6c and heated by the induction heating coil left 13b and the induction heating coil center 13c. The same is true for.

  Next, the relationship between the induction heating coil right 13a, the inner temperature detector 16, and the outer temperature detectors 17a and 17b will be described with reference to FIGS. In addition, since the induction heating coil right 13b is the same, the description about the induction heating coil right 13b is omitted.

  First, the case where the cooking pan 20 having a diameter of about 200 mm is placed on the placement portion right 6a of the top plate 3 and heated will be described.

  The induction heating coil right 13a corresponding to the placement portion right 6a of the top plate 3 has a large coil diameter of about 200 mm and an output of about 3 kW, so that the cooking pan 20 having a pan bottom diameter of about 200 mm is connected to the induction heating coil right 13a. When placed according to (placement portion right 6a), the gap 15 is maintained between the inner induction heating coil 13a1 and the outer induction heating coil 13a2, and the magnetic flux generated by both coils is dispersed to make the temperature of the pan uniform. However, as shown in FIG. 5 (a), at the initial stage of starting heating, the outer temperature detector 17 detects the temperature at the center of the cooking pan 20 detected by the inner temperature detector 16. The detected peripheral part will rise quickly and become hot.

  Therefore, the temperature at the center of the pan bottom and the temperature at the periphery of the pan are detected by the inner temperature detector 16 and the outer temperature detectors 17a and 17b provided in the gap 15, and the inverter control means from the inverter right 72a as the detection signal right 77a. The control signal 74 is sent to the right 73 a and the control signal right 78 a is sent to the control means 74.

Here, the detection signal right 77a will be described in detail. The detection signal right 77a is obtained by using the outputs of the three temperature detectors of the inner temperature detector 16 and the outer temperature detectors 17a and 17b, and the three temperature detectors are arranged substantially linearly. In this embodiment, the calculation is performed using one of the following equations. In the following, the temperatures detected by the inner temperature detector 16 and the outer temperature detectors 17a and 17b are Th16 (first temperature information), Th17a (second temperature information), and Th17b (third temperature information), respectively. ). And
(Th16−Th17b) + (Th17a−Th17b) (Equation 1)
(Th16−Th17a) + (Th17b−Th17a) (Equation 2)
Or expanded (Equation 1) (Equation 2),
Th16 + Th17a−2 × Th17b (Equation 3)
Th16−2 × Th17a + Th17b (Equation 4)
And
The magnitude relationship between these calculation results and a predetermined value X is obtained. The value of X is switched according to the cooking mode, and is, for example, 120 in the manual mode and 100 in the fried food mode.

  When the calculation result of either (Equation 1) or (Equation 2) is larger than X, the detection signal right 77a indicating “pan temperature unevenness” is generated, and when the calculation result is smaller than X, “pot bottom” A detection signal right 77a indicating "uniform temperature" is generated and output from the inverter right 72a to the inverter control means right 73a.

  When the control means 74 receives a signal indicating “pan temperature uneven”, the control means 74 controls the induction heating coil to stop heating or weaken the heating power, and receives a signal indicating “pan temperature uniform”. Then, the induction heating coil is controlled so as to maintain or strengthen the heating power.

  When the cooking pan 20 having a diameter of about 200 mm is placed at a normal position, Th17a and Th17b are substantially equal, and the difference between these and Th16 is also small. Therefore, the calculation result of (Expression 1) or (Expression 2) Is smaller than X. That is, a detection signal right 77a indicating “pan temperature uniform” is generated and transmitted to the control means 74 via the inverter control means 73a.

  As a result, the control means 74 sends the control signal right 78a to the inverter control means right 73a through the reverse route to the above, and further controls the inverter 72 by sending the detection signal right 77a to the inverter 72, thereby induction heating. The electric power is controlled so as to maintain the heating power of the outer induction heating coil 13a2 of the coil right 13a.

  The temperature difference detected by the inner temperature detector 16 and the outer temperature detectors 17a and 17b is closely related to the output when heating the heated object. When the output is large, the inner temperature detector 16 and the outer temperature detection are detected. The temperature difference detected by the devices 17a and 17b is likely to occur, and when the output is small, the difference is difficult to occur. Therefore, the predetermined value X is set to a large value in the manual mode in which heating can be performed at a maximum of 3 kW, and a value smaller than that in the manual mode in the deep-fried food mode in which the output is lower than the manual mode and set in advance by the program. Also, in the deep-fried food mode, the reason why this X value is set low is that, even when the pan deviates from the center, as described later, the pan shift can be detected before the oil temperature reaches a high abnormal temperature. Yes.

  In addition to the above, the inner temperature detector 16 and the outer temperature detectors 17a and 17b may be used when the temperature does not rise even after a predetermined time has elapsed since the start of heating, or when the X value becomes larger than the predetermined value. Control is performed such as stopping heating in response to a warped central portion or peripheral portion.

  Next, the case where the small cooking pot 20 with a diameter of about 120 mm is placed on the placement portion right 6a of the top plate 3 with a large deviation from the center will be described. In this case, in the case where the position is shifted up and down or left and right, the inner temperature detector 16 provided at the center of the inner induction heating coil 13a1 and at least one of the outer temperature detectors 17a and 17b. Thus, the pan bottom temperature of the cooking pan 20 is detected, and the detection signal right 77a is sent from the inverter right 72a to the inverter control means right 73a. Further, the control signal right 78a is sent to the control means 74, and the inner induction heating coil 13a1 The electric power of the outer induction heating coil 13a2 is supplied while being controlled to prevent the cooking pan 20 from being baked or generating smoke or the like.

  Even when a small-diameter pan is placed out of position, if the temperature of the pan bottom can be detected by a total of two temperature detectors, at least one of the inner temperature detector 16 and the outer temperature detectors 17a and 17b, By performing the evaluation using Equation (1) or (Equation 2), it is possible to determine whether or not the temperature of the pan bottom is uniform, and to perform control accordingly.

  And when the detection signal right 77a which shows "pan temperature uniform" is produced | generated, it controls to the direction which lowers | hangs the electric power of the outer induction heating coil 13a2, suppresses the local temperature rise of the cooking pan 20, and the pan bottom temperature is uniform. Plan In particular, when the cooking pan 20 is disposed on the front side of the housing 2 that is likely to be placed on the side close to the user side, the inner temperature detector 16 and the outer temperature detector 17a on the front side ensure the inner side. The electric power of the induction heating coil 13a1 and the outer induction heating coil 13a2 is controlled.

  As described above, according to the present embodiment, even when a small-sized cooking pan is used and the cooking pan is placed off the center of the induction heating coil, the inner temperature detector and the outer temperature detector. This makes it possible to detect the temperature at the bottom of the pan at an early stage, control the power of the inner induction heating coil and the outer induction heating coil, and the temperature around the pan bottom suddenly rises to prevent burning, smoke, etc. It is safe and you can cook with confidence.

  Next, the induction heating cooker of Example 2 will be described. The description of the same points as in the first embodiment will be omitted.

In the first embodiment, when the detection signal 77 is obtained, (Equation 1), (Equation 2), or (Equation 3) or (Equation 4) is used. However, in this embodiment, another arithmetic expression is used. . That is,
(Th16−Th17b) + (Th16−Th17a) (Equation 5)
Or expanded (Equation 5),
2 × Th16−Th17a−Th17b (Equation 6)
And the magnitude relationship between these calculation results and the predetermined value Y is obtained. The value of Y is switched according to the cooking mode, for example, 25 in the deep-fried food mode.

  Also according to (Equation 5) or (Equation 6) shown in the present embodiment, the pan bottom temperature is detected by at least two temperature detectors whether the pan bottom temperature of the small-diameter pan is uniform as in the first embodiment. It can be determined if possible.

DESCRIPTION OF SYMBOLS 1 System kitchen 2 Case 3 Top plate 6 Mounting part 9 Upper surface operation part 10 Upper surface display part 13 Induction heating coil 13a Induction heating coil right 13b Induction heating coil left 13c Induction heating coil center 13a1 Inner induction heating coil 13a2 Outer induction heating coil 16 Inner temperature detector 15 Clearance 17 (17a, 17b) Outer temperature detector 19 Mounting frame 21 Magnetic shield 23 Arrangement area 72 Inverter 73 Inverter control means 74 Control means 75 Operation / display section

Claims (3)

A top plate displaying an annular mounting frame on which the pan is placed;
An induction heating coil provided below the mounting frame for induction heating the pan;
In the induction heating cooker provided with three temperature detectors provided on the lower surface of the top plate and detecting the temperature of the pan placed in the mounting frame,
The first temperature detector is disposed at a position where the pan with the smallest diameter that can be used is covered with the pan bottom no matter where the pan is placed in the mounting frame.
The second temperature detector is either a case where a pan having the smallest diameter that can be used is installed at the center of the mounting frame, or a case in which the pan is inscribed on the front side or the right side of the mounting frame. It is covered at the bottom of the pan, and is placed at a position where it is not covered by the pan bottom when placed on the back side or the left side of the mounting frame,
The third temperature detector is either a case where the pan with the smallest diameter that can be used is installed in the center of the mounting frame, or a case where the pan is inscribed on the back side or the left side of the mounting frame. An induction heating cooker characterized by being placed at a position that is covered by the bottom of the pan and not covered by the bottom of the pan in any case where it is inscribed on the front side or the right side of the mounting frame. A top plate displaying an annular mounting frame on which the pan is placed;
An induction heating coil provided below the mounting frame for induction heating the pan;
In the induction heating cooker provided with three temperature detectors provided on the lower surface of the top plate and detecting the temperature of the pan placed in the mounting frame,
The first temperature detector is disposed at a position where the pan with the smallest diameter that can be used is covered with the pan bottom no matter where the pan is placed in the mounting frame.
The second temperature detector is either a case where the pan with the smallest diameter that can be used is installed in the center of the mounting frame, or a case where the pan is inscribed on the front side or the left side of the mounting frame. It is covered at the bottom of the pan, and is placed at a position where it is not covered by the pan bottom when it is inscribed on the back side or the right side of the mounting frame,
The third temperature detector is either a case where a pan having the smallest diameter that can be used is installed at the center of the mounting frame, or a case where the pan is inscribed on the back side or the right side of the mounting frame. An induction heating cooker characterized in that it is covered at the bottom of the pan and placed in a position not covered by the bottom of the pan in any case where it is inscribed on the front side or the left side of the mounting frame. In the induction heating cooker according to claim 1 or 2,
The induction heating coil has a substantially annular gap between the inner induction heating coil and the outer induction heating coil,
The first temperature detector is disposed on the inner peripheral side of the inner induction heating coil,
The induction heating cooker, wherein the second and third temperature detectors are arranged in the gap.